Can you slave in a ECM

[pavetim]

I have an LB7 and a friend who has an lb7 also. Can I take his ecm and put it i my truck to flash some tunes?

[joecar]

A license attaches to an ECM not a VIN.

So, it will still cost you a license doing it like that; it would be simpler/quicker to just flash it in his truck.

[bballer182]

Licenses are based on the serial number within ECM not the VIN.

[pavetim]

Don't know why he don't want to bring his truck, maybe too far to drive, maybe it's broke lol. He just asked me if I could slave it in and flash the tune. I know i'd need a license just making sure nothing else will clash.

[ScarabEpic22]

You can probably do that, Ive thrown PCMs/ECMs/TCMs in cars to test them and read them out before. Never flashed, for that you might have to do a VATS relink/relearn for your truck then do it. Probably easier for your friend to drive to you or buy a bench harness.

[ChipsByAl]

I am not sure about different model years but, if you are not planning on starting your truck with his ECM then flashing will work OK.
Al

[pavetim]

Is there something that goes thru how to make a bench harness? I found the tutorial here but it just shows wiring pinouts, not sure what wires i'd have to use.